aid: horizon-media name: Horizon Media description: >- Horizon Media is the largest independent media agency in the United States, founded in 1989 by Bill Koenigsberg and headquartered at 75 Varick Street in New York with offices in Los Angeles and Toronto. The agency employs roughly 2,300+ people, is ranked the third largest US media agency by COMvergence, and manages an estimated $8.7 billion in billings. Horizon operates a portfolio of specialty units (Horizon Next for performance, Blue Hour Studios for social/creator, Night Market for retail media, Scout Sports for sponsorship via Horizon Sports & Experiences, and the WHY Group for cultural insights) and runs a proprietary data and AI stack anchored by the Blu platform. In 2025 Horizon formed Horizon Global, a 50/50 US joint venture with Havas positioned at roughly $20 billion in combined billings, merging Blu with Havas Converged into a shared platform branded BluConverged, and is also building Horizon OS (Open Sphere) as an orchestration layer over the programmatic ad-tech stack. Horizon Media does not publish any public developer APIs, OpenAPI specifications, SDKs, or external developer portals, and its GitHub organization is private. All platforms documented here are internal/client-facing proprietary systems rather than open developer APIs. type: Index image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg url: >- https://raw.githubusercontent.com/api-evangelist/horizon-media/refs/heads/main/apis.yml humanURL: https://www.horizonmedia.com/ created: '2025-03-01' modified: '2026-05-23' specificationVersion: '0.20' tags: - Advertising - Media Agency - Media Planning - Media Buying - Programmatic - Retail Media - Sports Marketing - Social Media - Influencer Marketing - Cultural Intelligence - Data Platform - AI Platform - MarTech - AdTech - Independent Agency apis: [] common: - type: TrustCenter url: security/horizon-media-trust-center.yml - type: DomainSecurity url: security/horizon-media-domain-security.yml - type: Website url: https://www.horizonmedia.com/ - type: Independence url: https://www.horizonmedia.com/independence - type: Innovation url: https://www.horizonmedia.com/innovation - type: Integrity url: https://www.horizonmedia.com/integrity - type: Inclusion url: https://www.horizonmedia.com/inclusion - type: Intentionality url: https://www.horizonmedia.com/intentionality - type: Insights url: https://www.horizonmedia.com/insights - type: Contact url: https://www.horizonmedia.com/interested - type: Sitemap url: https://www.horizonmedia.com/sitemap.xml - type: LinkedIn url: https://www.linkedin.com/company/horizon-media - type: GitHub url: https://github.com/horizonmedia description: >- Horizon Media maintains a private GitHub organization with no public repositories, no public members, and ~30 followers. - type: ProprietaryPlatform title: Blu url: https://www.horizonmedia.com/innovation description: >- Horizon's flagship connected marketing and AI platform. Originally launched in 2020 as an advanced data platform with machine learning, Blu has since evolved into a "transparent business consultancy" platform that analyzes business goals through a media lens, builds and analyzes custom audiences, runs competitive analysis, and answers strategic business questions. Architecturally Blu organizes data in a flat lattice structure for AI access, lists data sources and model details for transparency, operates inside each client's own cloud and data walls, taps multiple LLMs, and uses TransUnion data as a "data spine." Creative assembly, scoring, and generation are in pilot via APIs, MCPs, and agentic options. - type: ProprietaryPlatform title: BluConverged url: https://www.horizonmedia.com/innovation description: >- Joint AI and data platform created by merging Horizon's Blu with Havas's Converged marketing operating system, powering the Horizon Global JV. - type: ProprietaryPlatform title: Horizon OS (Open Sphere) url: https://www.horizonmedia.com/innovation description: >- Ad-tech orchestration and intelligence layer that sits above the programmatic stack, dynamically routing ad spend across DSPs, SSPs, verification, data, and measurement partners (Trade Desk, DV360, Amazon, Clearline, etc.) based on real-time performance signals. Horizon has issued RFIs to 200+ potential partners and is in active pilot integration. Monetization is on decision-making intelligence rather than inventory markups. - type: ProprietaryPlatform title: Swell Audience Network url: https://digiday.com/media-buying/horizons-blue-hour-social-shop-partners-with-platform-key-to-launch-talent-management-tool/ description: >- Talent and audience management platform built by Blue Hour Studios with Platform Key, providing programmatic audience segmentation, demographics, geolocation, and third-party analytics across health, wellness, fashion, sports, and music verticals. - type: ProprietaryPlatform title: Cogent url: https://www.horizonmedia.com/innovation description: >- Horizon's proprietary data and intelligence platform brand, sitting alongside Blu in the agency's data and analytics stack. - type: ProprietaryPlatform title: Big url: https://www.horizonmedia.com/innovation description: >- Horizon's proprietary creative platform brand used for creative development and optimization within the agency's tech stack. - type: ProprietaryPlatform title: Wave url: https://www.horizonmedia.com/innovation description: >- Horizon's cultural insights platform brand, associated with the WHY Group cultural intelligence practice that publishes work such as the annual Subculture Field Guide. - type: Division title: Horizon Next url: https://www.horizonmedia.com/insights/horizon-next-partners-with-artsai-on-proprietary-cross-platform-audio-measurement-framework description: >- Horizon Media's performance marketing unit, which has built a proprietary cross-platform audio measurement framework in partnership with ArtsAI. - type: Division title: Blue Hour Studios url: https://digiday.com/media-buying/horizons-blue-hour-social-shop-partners-with-platform-key-to-launch-talent-management-tool/ description: >- Horizon's social content and creator-economy division, founded in 2019 and led by Sarah Bachman. Operates the Swell Audience Network talent management platform via partnership with Platform Key. - type: Division title: Night Market url: https://www.horizonmedia.com/insights/night-market-introduces-first-ever-standardized-measurement-across-retail-media-networks-allowing-real-time-campaign-performance-assessment description: >- Horizon's retail media practice, which introduced a standardized measurement framework across retail media networks for real-time campaign performance assessment. - type: Division title: Horizon Sports & Experiences (HS&E) url: https://www.horizonmedia.com/ description: >- Horizon Media's sports, entertainment, and live-experiences holding group, parent of Scout Sports & Entertainment and related sponsorship and partnerships brands. - type: Division title: Scout Sports & Entertainment url: https://www.horizonmedia.com/ description: >- Sponsorship and sports-marketing practice operating under Horizon Sports & Experiences. - type: Division title: WHY Group url: https://www.horizonmedia.com/insights/passion-over-age-the-2024-subculture-field-guide-urges-marketers-to-embrace-niche-over-the-norm description: >- Horizon's strategy and cultural-intelligence practice; publisher of the annual Subculture Field Guide and ongoing cultural deep dives. - type: JointVenture title: Horizon Global url: https://digiday.com/marketing/why-horizon-and-havas-are-joining-forces/ description: >- 50/50 US joint venture between Horizon Media and Havas announced in September 2025, focused exclusively on US operations for global accounts. Bob Lord serves as interim CEO, Renata Spackova as global COO, with a board including Bill Koenigsberg and Yannick Bolloré. Expected to command roughly $20 billion in annual billings and runs on the combined BluConverged platform. - type: Leadership title: Bill Koenigsberg url: https://www.horizonmedia.com/ description: Founder, CEO and Chairman of Horizon Media (founded 1989). - type: Leadership title: Bob Lord url: https://www.horizonmedia.com/ description: >- President of Horizon Holdings and interim CEO of the Horizon Global JV with Havas. - type: Leadership title: Domenic Venuto url: https://www.horizonmedia.com/insights/horizon-media-taps-tech-titan-domenic-venuto-as-evp-chief-of-product-data description: EVP, Chief of Product & Data, leading Horizon's product and data org. - type: Leadership title: Tim Rich url: https://www.horizonmedia.com/insights/horizon-media-announces-tim-rich-as-new-head-of-ai-solutions description: Head of AI Solutions. - type: Partner title: TransUnion url: https://www.horizonmedia.com/innovation description: Identity and audience data spine underlying the Blu platform. - type: Partner title: Platform Key url: https://digiday.com/media-buying/horizons-blue-hour-social-shop-partners-with-platform-key-to-launch-talent-management-tool/ description: Talent platform partner powering Blue Hour Studios' Swell Audience Network. - type: Partner title: ArtsAI url: https://www.horizonmedia.com/insights/horizon-next-partners-with-artsai-on-proprietary-cross-platform-audio-measurement-framework description: Measurement partner for Horizon Next's cross-platform audio measurement framework. - type: Partner title: Havas url: https://digiday.com/marketing/why-horizon-and-havas-are-joining-forces/ description: Joint-venture partner in the Horizon Global US JV. - type: Press title: Horizon and Havas joint venture url: https://digiday.com/marketing/why-horizon-and-havas-are-joining-forces/ - type: Press title: Blu AI platform as transparent business consultancy url: https://digiday.com/marketing/horizons-blu-ai-platform-focuses-on-being-a-transparent-business-consultancy/ - type: Press title: Horizon OS (Open Sphere) ad-tech orchestration platform url: https://digiday.com/future-of-tv-briefing/future-of-marketing-briefing-horizon-media-is-building-a-platform-to-orchestrate-ad-tech-from-a-single-command-center/ - type: Press title: Horizon Global red-ocean differentiation url: https://digiday.com/marketing/media-buying-briefing-how-horizon-and-havas-jv-aims-to-distinguish-itself-in-a-red-ocean/ maintainers: - FN: API Evangelist url: https://apievangelist.com email: info@apievangelist.com